Cooler



FIG. 1 is a left side, perspective view of the cooler thereof;

FIG. 2 is a front side elevational view thereof;

FIG. 3 is a rear side elevational view thereof;

FIG. 4 is a top plan elevational view thereof;

FIG. 5 is a bottom plan elevational view; and,

FIG. 6 is a left side elevational view thereof, the right side elevational view being a mirror image.

The broken line elements are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a cooler, as shown and described. 